SmogRank / Switzerland / Vaud / Payerne
Payerne, month by month
Payerne has a measured daily mean on 1,023 days since 1 January 2023. Its worst month was February 2025, at 76 US AQI (22.5 µg/m³), 385th of 2,633 cities on that month's world ranking. Its cleanest was November 2023, at 16 US AQI (2.8 µg/m³). 2025 averaged 50 US AQI (9.0 µg/m³), against 34 US AQI (6.1 µg/m³) in 2023.
Every month since 2023
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Months without a mean, and why
11 months
| Month | Why |
|---|---|
| Jun 2026 | 15 of 30 days measured; a month needs 21. The others: 11 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours). |
| Jun 2025 | 19 of 30 days measured; a month needs 21. The others: 11 with readings for part of the day (a day needs 18 hours). |
| Oct 2024 | 14 of 31 days measured; a month needs 22. The others: 17 with readings for part of the day (a day needs 18 hours). |
| Sep 2024 | No day measured. The others: 4 with no readings from the monitor, 26 with readings for part of the day (a day needs 18 hours). |
| Aug 2024 | 15 of 31 days measured; a month needs 22. The others: 8 with no readings from the monitor, 8 with readings for part of the day (a day needs 18 hours). |
| Jun 2024 | 5 of 30 days measured; a month needs 21. The others: 23 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours). |
| Apr 2024 | No day measured. The others: 30 with no readings from the monitor. |
| Mar 2024 | 10 of 31 days measured; a month needs 22. The others: 19 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours). |
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 2 of 28 days measured; a month needs 20. The others: 1 with readings for part of the day (a day needs 18 hours), 25 missing from OpenAQ's archive. |
| Jan 2023 | 8 of 31 days measured; a month needs 22. The others: 3 with no readings from the monitor, 13 with readings for part of the day (a day needs 18 hours), 7 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Payerne's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2025 | 7622.5 µg/m³ | 385thof 2,633 | Europe, 14 February to 1 March 2025 Europe, 1 to 14 February 2025 |
| December 2025 | 5611.7 µg/m³ | 1,008thof 3,006 | – |
| March 2026 | 5511.0 µg/m³ | 1,423rdof 2,971 | Europe, 1 to 12 March 2026 |
| August 2025 | 529.5 µg/m³ | 1,350thof 2,901 | – |
| June 2023 | 529.4 µg/m³ | 883rdof 1,603 | – |
| January 2025 | 529.4 µg/m³ | 1,099thof 2,474 | Germany, France and 19 more countries, January 2025 |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Payerne's worst days
| Day | US AQI | Episode |
|---|---|---|
| 11 Jun 2025 | 11842.4 µg/m³ | Europe, June 2025 |
| 10 Jun 2025 | 10436.6 µg/m³ | Europe, June 2025 |
| 19 Feb 2025 | 9633.3 µg/m³ | Europe, 14 February to 1 March 2025 |
| 20 Feb 2025 | 9633.1 µg/m³ | Europe, 14 February to 1 March 2025 |
| 17 Feb 2025 | 9331.5 µg/m³ | Europe, 14 February to 1 March 2025 |
| 8 Feb 2025 | 9130.5 µg/m³ | Europe, 1 to 14 February 2025 |
| 16 Feb 2025 | 9030.2 µg/m³ | Europe, 14 February to 1 March 2025 |
| 10 Feb 2025 | 9030.0 µg/m³ | Europe, 1 to 14 February 2025 |
| 7 Mar 2026 | 8929.6 µg/m³ | Europe, 1 to 12 March 2026 |
| 11 Feb 2025 | 8929.5 µg/m³ | Europe, 1 to 14 February 2025 |
Daily means, the highest since 1 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Payerne, Switzerland, 1 Jan 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/ch/payerne/history (accessed 12 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Payerne now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 18:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).